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| 1 | +import { Dexie } from 'dexie'; |
| 2 | + |
| 3 | +/** |
| 4 | + * Create the runtime catalog boundary for site cache freshness and reads. |
| 5 | + * |
| 6 | + * @param {Object} deps Catalog dependencies |
| 7 | + * @param {Object} deps.remote Remote adapter |
| 8 | + * @param {Object} deps.store Snapshot store adapter |
| 9 | + * @returns {{boot: (manifest: {revision: string, pageSize?: number}) => Promise<{revision: string, source: string, count: number}>, list: (orderBy?: string) => Promise<Array>}} |
| 10 | + */ |
| 11 | +export function createAllSitesCatalog( { remote, store } ) { |
| 12 | + let bootPromise; |
| 13 | + |
| 14 | + return { |
| 15 | + async boot( manifest ) { |
| 16 | + if ( ! manifest?.revision ) { |
| 17 | + throw new Error( 'Catalog boot requires a revision' ); |
| 18 | + } |
| 19 | + |
| 20 | + if ( ! bootPromise ) { |
| 21 | + bootPromise = ensureFreshSnapshot( |
| 22 | + manifest, |
| 23 | + remote, |
| 24 | + store |
| 25 | + ).finally( () => { |
| 26 | + bootPromise = undefined; |
| 27 | + } ); |
| 28 | + } |
| 29 | + |
| 30 | + return bootPromise; |
| 31 | + }, |
| 32 | + |
| 33 | + list( orderBy = 'name' ) { |
| 34 | + return store.readAll( orderBy ); |
| 35 | + }, |
| 36 | + }; |
| 37 | +} |
| 38 | + |
| 39 | +async function ensureFreshSnapshot( manifest, remote, store ) { |
| 40 | + const snapshot = await store.getSnapshotMeta(); |
| 41 | + if ( snapshot?.revision === manifest.revision ) { |
| 42 | + return { |
| 43 | + revision: snapshot.revision, |
| 44 | + source: 'cache', |
| 45 | + count: snapshot.count, |
| 46 | + }; |
| 47 | + } |
| 48 | + |
| 49 | + await store.clear(); |
| 50 | + |
| 51 | + const items = await fetchSnapshot( manifest, remote ); |
| 52 | + await store.replaceSnapshot( { |
| 53 | + revision: manifest.revision, |
| 54 | + items, |
| 55 | + } ); |
| 56 | + |
| 57 | + return { |
| 58 | + revision: manifest.revision, |
| 59 | + source: 'network', |
| 60 | + count: items.length, |
| 61 | + }; |
| 62 | +} |
| 63 | + |
| 64 | +async function fetchSnapshot( manifest, remote ) { |
| 65 | + const items = []; |
| 66 | + let offset = 0; |
| 67 | + const pageSize = Number( manifest.pageSize ) || 100; |
| 68 | + |
| 69 | + while ( true ) { |
| 70 | + const page = await remote.fetchPage( { |
| 71 | + offset, |
| 72 | + limit: pageSize, |
| 73 | + expectedRevision: manifest.revision, |
| 74 | + } ); |
| 75 | + |
| 76 | + if ( page.revision !== manifest.revision ) { |
| 77 | + throw new Error( 'Catalog revision changed during hydration' ); |
| 78 | + } |
| 79 | + |
| 80 | + if ( page.items.length > 0 ) { |
| 81 | + items.push( ...page.items ); |
| 82 | + } |
| 83 | + |
| 84 | + if ( page.done ) { |
| 85 | + return items; |
| 86 | + } |
| 87 | + |
| 88 | + offset += pageSize; |
| 89 | + } |
| 90 | +} |
| 91 | + |
| 92 | +/** |
| 93 | + * Create the production Dexie-backed store for site snapshots. |
| 94 | + * |
| 95 | + * @param {Object} options Store configuration |
| 96 | + * @param {string} options.dbName Database name |
| 97 | + * @param {string} options.sitesTable Sites table name |
| 98 | + * @returns {{getSnapshotMeta: () => Promise<{revision: string, count: number}|null>, clear: () => Promise<void>, replaceSnapshot: (input: {revision: string, items: Array}) => Promise<void>, readAll: (orderBy?: string) => Promise<Array>}} |
| 99 | + */ |
| 100 | +export function createDexieSnapshotStore( { dbName, sitesTable } ) { |
| 101 | + const db = new Dexie( dbName ); |
| 102 | + db.version( 1 ).stores( { |
| 103 | + [ sitesTable ]: 'id,name,url', |
| 104 | + } ); |
| 105 | + db.version( 2 ).stores( { |
| 106 | + [ sitesTable ]: 'id,name,url,timestamp', |
| 107 | + } ); |
| 108 | + db.version( 3 ).stores( { |
| 109 | + [ sitesTable ]: 'id,name,url,timestamp,blog_id', |
| 110 | + } ); |
| 111 | + db.version( 4 ).stores( { |
| 112 | + [ sitesTable ]: 'id,name,url,blog_id', |
| 113 | + catalog_meta: 'key', |
| 114 | + } ); |
| 115 | + |
| 116 | + const metaTable = db.table( 'catalog_meta' ); |
| 117 | + const siteTable = db.table( sitesTable ); |
| 118 | + |
| 119 | + return { |
| 120 | + async getSnapshotMeta() { |
| 121 | + const meta = await metaTable.get( 'snapshot' ); |
| 122 | + if ( ! meta?.revision ) { |
| 123 | + return null; |
| 124 | + } |
| 125 | + |
| 126 | + return { |
| 127 | + revision: meta.revision, |
| 128 | + count: Number( meta.count ) || 0, |
| 129 | + }; |
| 130 | + }, |
| 131 | + |
| 132 | + async clear() { |
| 133 | + await db.transaction( 'rw', siteTable, metaTable, async () => { |
| 134 | + await siteTable.clear(); |
| 135 | + await metaTable.delete( 'snapshot' ); |
| 136 | + } ); |
| 137 | + }, |
| 138 | + |
| 139 | + async replaceSnapshot( { revision, items } ) { |
| 140 | + await db.transaction( 'rw', siteTable, metaTable, async () => { |
| 141 | + await siteTable.clear(); |
| 142 | + if ( items.length > 0 ) { |
| 143 | + await siteTable.bulkPut( items ); |
| 144 | + } |
| 145 | + await metaTable.put( { |
| 146 | + key: 'snapshot', |
| 147 | + revision, |
| 148 | + count: items.length, |
| 149 | + } ); |
| 150 | + } ); |
| 151 | + }, |
| 152 | + |
| 153 | + async readAll( orderBy = 'name' ) { |
| 154 | + return siteTable.orderBy( orderBy ).toArray(); |
| 155 | + }, |
| 156 | + }; |
| 157 | +} |
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